#include <stdio.h>
#include <stdlib.h>
int main(int argc, char * argv[])
{
	if (argc < 2) 
    {
      printf("need a number\n");
      return -1;
    }
  	int v0 = (int)strtol(argv[1], (char **)NULL, 10);
  	int v1 = v0;
  	printf("argument = %d\n", v0);
  	int q = 0;
  	/* divide v by 5 */
	while (v1 >= 5)
	{
		q ++;
		v1 -= 5;
	}
	printf("%d / 5 = %d\n", v0, q);
  return 0;
}
